I don't think they played any demos in 2002 and 2003 but I could be wrong. Last year they had a couple of quite unspectacular demos on the English and Dutch convention. They were voiced over every 20 seconds by GB saying "property of Queen Productions" and it was not much fun to listen.

already mentioned by YourValentine: www.queenpicturehall.com/queenbox/ I used to call this section "queen anthology box sets" but they probably wont be released in that format anymore, so I changed the name :)